Light Meter displays measurements from LI-COR radiation sensors. The LI-250A provides high-resolution reading and conversion of microamp signals from the attached light sensor into suitable light measurement units.

A quantum sensor measures photosynthetically active radiation (µmol s -1 m-2 of PAR), a pyranometer measures solar radiation (W m-2 ), and a photometric sensor measures illuminance (lux).

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Light meter LI-250A

Rajarata University of Sri Lanka

Product Category/ Test Name (Matrix):

Light meter

Sub Category:


Service Charge (Rs) -

Manufacturer LI-COR Funding Source HETC/QIG
Model LI-250A Whether the equipment service can be provided to external researchers/institutions Yes
Manufactured Year 0000 Availability of Technically Competent Staff Yes
HS Code Instrument Condition Functioning well
Vendor Name Islandwide Scientific (pvt) Ltd Commencement of Operations Date 2014-07-21
Vendor Contact +94112681150 InstrumentPrice 545900.00
Vendor Url Stage of the Record Incomplete
Catalog Aceess
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Institute Rajarata University of Sri Lanka
Faculty Agriculture
Department Agricultural Systems
Laboratory Agroecology Laboratory
Contact Person Name
Phone Number 0252235102
Mobile Number
Product Category Light meter
Sub Category
Testing Paremeters Photosynthetically Active Radiation (µmol s -1 m-2 of PAR), Solar Radiation (W m-2 ), Illuminance (lux)
Description Light measurements can be obtain using radiation sensors. The quantum sensor measures Photosynthetically Active Radiation (µmol s -1 m-2 of PAR), The Pyranometer measures solar radiation (W m-2), and the photometric sensor measures illuminance (lux)
Relevant Instruments Light meter, Radiation sensors (quantum sensor, Pyranometer, photometric sensor)
Technical Specification
  • Accuracy:
    • 25 °C: Typically ± 0.4% of reading ± 3 counts on the least significant digit displayed (all ranges).
    • 0 - 55 °C: Typically ± 0.6% of reading ± 3 counts on the least significant digit displayed (all ranges).
  • Range Selection: Autoranging (3 ranges).
  • Linearity: ± 0.05%.
  • Sensors: Designed for type "SA" sensors; type "SB" and "SL" sensors with BNC connectors are also compatible when calconnector or millivolt adapter are removed.
  • Sensor Calibration: Each sensor is supplied with a calibration multiplier. Calibration multipliers for two sensors can be stored in memory. Calibration multipliers are entered from the keypad.
  • Signal Averaging: Sensor output can be collected and displayed as a 15-second average (approximately 60 readings). Averages are retained on the display in HOLD mode.
  • Display: LCD display. Updated every 0.5 seconds in Instantaneous mode.
  • Battery Life: 150 hours typical with continuous operation.
  • Power Requirement: One 9V Alkaline battery.
  • Operating Conditions: 0 to 55 °C, 0 to 95% RH (non-condensing).
  • Storage Conditions: -55 to 60 °C, 0 to 95% RH (non-condensing).
  • Size: 14 cm × 7.7 cm × 3.8 cm (5.5" × 3" x1.5").
  • Weight: 0.26 kg (0.57 lbs).


Sensor Range Resolution
Quantum 0-199 µmol s-1 m-2
0.01 µmol s-1 m-2
Pyranometer 0-19 W m-2
0.001 W m-2
Photometric 0-1999 lux
0-19999 lux
0-199 klux
0.1 lux
0.01 klux
Number of samples per cycle 0
Number of samples per day 0
Total usage hour per day 0

Under Development Stage

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